Photographic film with colored laminated base



March 11 1924 11,486,245

J. H. HAsTE ET AL PHOTOGRAPHIC FILM WITH COLORED LAMINATED BASE Filed Dec. 26 1922 flez gregehz'calg Serasz'iieelqger Supper? 'ers ofZZzgZoseAddz'Zz'ew e0 elm madam; 7zzZr0ceZZzzZa5e, Ce lose aceizzie, cellulose eilzez'.

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. intents reams E- TE AND ERWIN 3T. WARD, OF ROCHESTER, N YORK, 'ASSIGNORS TQ' BEST, NEW YORK, ACORFORATION 618 NEW PHOTOGRATHIG FILM H CULORED iAIdINATED BASE.

Application filed hecemb er 26, 1922. Serial l lo. 609,026.

To aZZ whom it may concern:

Be it known that we, JAMEs H. Hssrn and ERWIN J. WARD, citizens of the United States of America, residing at Rochester,

5 in the county of Monroeand State of New York, have invented certain new and useful Improvements in Photographic Films with Colored Laminated Bases, of which the following is a full, clear, and exact specifica- 19 tion.

' This invention relates to photographic films having laminated supports of cellulosic material. The preferred embodiment of the invention relates to colored or pretinted films. The principal object/of the invention is to produce such afilm in which the coloring material is protected mechanically and.

chemically by the laminations which make the support. Other objects will herein In thef accompanying drawing. the single figure" leaf-diagrammatic sectional view on.

an exaggerated scale of a film embodying the preferred form of our invention. here 2 the layers of film blend into each other by a sort of weld continuous Outlines are omitted.

Photographic films having a permanent color in the support or base are coming into as commercial use in increasing quantities.

At present the greatest activity is in the roduction of motion picture positive lms which are pretinted so that the proper tone or efiect will be given to'the projected picture without the necessity of dyeing the gelatin layer containing the silver image.

' Under certain circumstances it is desirable to afford the coloring material greater protection, both mechanically and chemically,

cc than has been done in pretinted films heretofore. We have discovered that such a result maybe obtained by locating the coloring material in a relatively thin zone of interunion between two relatively thicker ina terunited laminations of cellulosic material. Referring to. the drawing, which shows the preferred form of our invention, 1 represents the photographicallly sensitive layer, say acoating of gelatino-si ver-haloid emulac sion. The support for the emulsion comprises two supporting layers Qwhich are referably composed of compositions of cel-, ulosic addition compounds, such as nitrocellulose, cellulose acetate and cellulose ether.

for softening trace, say lpart. To

The compositions may, of course, contain the usual modifying agents, such as high boiling solvents or softeners, as will be readily understood by those skilled in the art.

The layers 2 are joined together by a cement or solvent in such a way as to cause a relatively thin layer or zone 3 of interunion. The entire adjacent faces of the layers 2 are thus blended together, so as to form a practically inseparable support. The coloring material is applied in or by means of the cement or solvent which effects the interunion and thus the coloring material is located in the zone 3, where it is protected from all of the developing, fixing, washing and, above all, bleaching baths to which the film may be subjected. lit is likewise located away from the rear surface of the film which is some times subjected to scratching when motion picture positive film is run through apparatus of defective desi or defective conditioni e The layers 2 are preferably flexible and transparent, and it is desirable, in the. re-

ferred form of our invention, that the colored zone of interunion 3 be likewise transparent. The cement is selected with this end in view. Any; good transparent film cement containing a suitablecoloring materiahsuch as a s irit dye, for instance, may be employed. lso a solvent mixture before pressin them together may. be employed instea of a cement containing a cellulosic material. Here again a spirit dye can be employed. By way of example, we note the following useful composition for effecting the union,-acetone 20 parts, methyl alcohol 20 parts, methyLacetate 40 parts, butyl acetate 19 parts, and nitrocellulose a this may be added a spirit dye the amount of dye depending upon the is an instance be used. f

The zone 3 may contain just enough color of the right shade to neutralize any tionable color in the layers 2. Th1s is indicated in our prior application, Serial No. 594,562, filed Oct. 14, 1922 for photographic film with base of neutral tint, the present application being a continuation in part thereof.

Having thus described our invention, what the surfaces of the layers 2 depth of color desired. Safranine of one of the dyes that can ob ec- We claim as new Letters Patent is:

and desire to secure by wally sensitive layer, and a flexible lighttransmitting laminated support therefor which includes two relatively thick transparent layers of cellulosic addition compound interunited throughout their adie mee eee 'Tent laces, the relatively thin zone of inter- 1c union being colored and being profiected inechanically and chemically'by said thick ayers,

Signed at Rochester, New York, this 20th day of Dec., 1922., i n

JAMES H. HASTE.

ERWIZN J, WARD. 

